On 5 and 6 January 1979, US President Jimmy Carter, British Prime Minister James Callaghan, French President Valéry Giscard d’Estaing, and German Chancellor Helmut Schmidt met on the Caribbean island of Guadeloupe. These secret talks à quatre were intended to be a relaxed frank and free exchange on the current state of global politics, though Western security issues lay at the discussions’ heart. As we now know, it had been Schmidt who, behind the scenes, had been pressing the Carter administration to pursue informal (transatlantic) summitry - the Chancellor's preferred modus operandi. In view of growing Euro-strategic imbalances due to Soviet arms build-up, he sought to achieve political co-ordination among the key North Atlantic Treaty Or...